Back to EveryPatent.com
United States Patent | 5,526,049 |
Lee | June 11, 1996 |
An automatic focus circuit for use with a video camera comprises an analog to digital converter which converts an analog luminance signal provided from an image signal processing circuit into a digital luminance signal, a microcomputer for controlling the automatic focus unit using an integrated luminance value which is integrated in an integrating circuit, and an area dividing circuit for horizontally and vertically dividing a screen of a video camera monitor. The automatic focus operation is easily performed by using the integrated digital luminance value as stored in a memory circuit. Accordingly, the automatic focus circuit simplifies the constitution and accuracy of the automatic focus.
Inventors: | Lee; Jae S. (Inchon, KR) |
Assignee: | Samsung Electronics Co., Ltd. (Kyungki-do, KR) |
Appl. No.: | 351047 |
Filed: | November 28, 1994 |
Feb 29, 1992[KR] | 92-3389 |
Current U.S. Class: | 348/354; 348/355 |
Intern'l Class: | H04N 005/232 |
Field of Search: | 348/345,346,349,350,351,354,356,355 354/400,402 |
4544953 | Oct., 1985 | Goldman | 358/227. |
4614975 | Sep., 1986 | Kaito | 358/227. |
4922346 | May., 1990 | Hidaka et al. | 358/227. |
4967280 | Oct., 1990 | Takuma et al. | 358/227. |
4980773 | Dec., 1990 | Suda et al. | 358/227. |
5005086 | Apr., 1991 | Iwamoto et al. | 358/227. |
5115262 | May., 1992 | Komiya | 354/402. |
5150217 | Sep., 1992 | Senuma et al. | 358/227. |
5187585 | Feb., 1993 | Kaneda et al. | 358/227. |
5212516 | May., 1993 | Yamada et al. | 358/227. |